Alpha Version of Syncing and Desktop/Anroid PWA

frontend/public/sw.js

@@ -0,0 +1,66 @@
+const CACHE_NAME = 'inknote-v2';
+
+// Install — cache app shell on first load
+self.addEventListener('install', (e) => {
+  e.waitUntil(
+    caches.open(CACHE_NAME).then(async (cache) => {
+      // Cache the main page and manifest
+      const urls = ['/', '/manifest.json', '/icon-192.png', '/icon-512.png'];
+      for (const url of urls) {
+        try { await cache.add(url); } catch (err) { console.warn('[SW] Failed to cache:', url); }
+      }
+    })
+  );
+  self.skipWaiting();
+});
+
+// Activate — clean old caches
+self.addEventListener('activate', (e) => {
+  e.waitUntil(
+    caches.keys().then(keys => Promise.all(keys.filter(k => k !== CACHE_NAME).map(k => caches.delete(k))))
+  );
+  self.clients.claim();
+});
+
+// Fetch handler
+self.addEventListener('fetch', (e) => {
+  const url = new URL(e.request.url);
+
+  // Skip API/WebSocket requests entirely — handled by app + IndexedDB
+  if (url.pathname.startsWith('/api/') || url.pathname.startsWith('/ws')) return;
+
+  // Skip non-GET requests
+  if (e.request.method !== 'GET') return;
+
+  // Navigation (HTML pages) — network-first, fallback to cache
+  if (e.request.mode === 'navigate') {
+    e.respondWith(
+      fetch(e.request)
+        .then(r => { const c = r.clone(); caches.open(CACHE_NAME).then(cache => cache.put('/', c)); return r; })
+        .catch(() => caches.match('/'))
+    );
+    return;
+  }
+
+  // JS/CSS/images — stale-while-revalidate
+  e.respondWith(
+    caches.match(e.request).then(cached => {
+      const fetchP = fetch(e.request).then(r => {
+        if (r.ok && r.type === 'basic') {
+          caches.open(CACHE_NAME).then(cache => cache.put(e.request, r.clone()));
+        }
+        return r;
+      }).catch(() => cached);
+      return cached || fetchP;
+    })
+  );
+});
+
+// Background sync
+self.addEventListener('sync', (e) => {
+  if (e.tag === 'sync-changes') {
+    e.waitUntil(self.clients.matchAll().then(clients => {
+      clients.forEach(c => c.postMessage({ type: 'FLUSH_QUEUE' }));
+    }));
+  }
+});